<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<?php
			function example(&$m){
				$m = $m * 5 + 10;
				echo "在函数内：\$m =".$m;
			}
			$m = 1;
			example($m);
			echo "<p>在函数外：\$m = $m<p>";  
		?>
	</body>
</html>